It largely depends on what model of switch the phones are connected to, however here are some links to user card and voicemail instructions, hope it helps.
http://www142.nortelnetworks.com/bvdoc/norstarbcm/t7316uce03.pdf
http://www142.nortelnetworks.com/bvdoc/norstarbcm/nvm4_reference_guide.pdf
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